# ----------------------------------------------------------------------------
# pytform
# Copyright (c) 2008, Michael Henrique Siegwarth
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import Box2D2 as box2d

class CollisionListener(box2d.b2ContactListener):
    def __init__(self, level):
        box2d.b2ContactListener.__init__(self)
        self.level = level

    def Add(self, point):
        """Called when a contact point is created"""
        
        body1 = point.shape1.GetBody()
        body2 = point.shape2.GetBody()

        for e in self.level.level_add_events:
            if e.source_object.body == body1 and \
               e.trigger_object.body == body2:
                e.add(point.shape1, point.shape2, point.normal)
            elif e.source_object.body == body2 and \
                 e.trigger_object.body == body1:
                e.add(point.shape2, point.shape1, point.normal)
                
        for e in self.level.object_add_events:
            if e.source_object.body == body1 and \
               e.trigger_object.body == body2:
                e.add(point.shape1, point.shape2, point.normal)
            elif e.source_object.body == body2 and \
                 e.trigger_object.body == body1:
                e.add(point.shape2, point.shape1, point.normal)

    def Persist(self, point):
        """Called when a contact point persists for more than a time step"""
        pass
    
    def Remove(self, point):
        """Called when a contact point is removed"""
        body1 = point.shape1.GetBody()
        body2 = point.shape2.GetBody()

        for e in self.level.level_rem_events:
            if e.source_object.body == body1 and \
               e.trigger_object.body == body2:
                e.add(point.shape1, point.shape2, point.normal)
            elif e.source_object.body == body2 and \
                 e.trigger_object.body == body1:
                e.add(point.shape2, point.shape1, point.normal)

        for e in self.level.object_rem_events:
            if e.source_object.body == body1 and \
               e.trigger_object.body == body2:
                e.add(point.shape1, point.shape2, point.normal)
            elif e.source_object.body == body2 and \
                 e.trigger_object.body == body1:
                e.add(point.shape2, point.shape1, point.normal)
